The ability to add domains to Geopackage data in QGIS is in my opinion one of the major steps forward for QGIS in a long time.
This video will also demonstrate how to look behind the scenes using DBeaver and solve some of the shortcomings with the current implementation.

Chapters
0:00 Introduction
1:18 Demo Creating domains in QGIS
3:00 The problem
3:30 How it works and the solution (DBeaver)
5:59 Using domains in QGIS
7:59 Filters and Code value Domain
9:29 Deleting domains using DBeaver

Add field domain management capabilities to browser (Request in QGIS)
https://github.com/qgis/QGISDocument...
Download DBever Community edition
https://dbeaver.io/
My site on QGIS (and other graphical topics)
https://www.geoinformatics.online/sof...